Looks and sounds like a job for CLR. Sponge or pour it on heavy or soak a rag in it and cover the area with the drenched rag. Give it 15 minutes and mop it up. It removes calcium, lime and rust but it's not caustic. Do wear gloves as with all cleaning products.

Remove the silicone with a putty knife and scrub the mold with bleach. It works wonders.

I tried lots of methods. The easiest, most effective was to use toilet cleaner with bleach in it (Clorox brand worked for me). Just use the spout to run it down the grout lines and wait a few hours, then rinse. I was shocked that it actually worked with no scrubbing. You will need to remove the silicone caulk/sealant first and put new sealant down after cleaning.

The mould is behind the silicon. You wont be able to clean that without removing the silicon first, cleaning and the replacing it.

Water is getting behind the silicon which is a problem. That should not be happening. It might be that your tap is leaking between the tiles and the waterproofing membrane. It might be somthing else. You probably should get it checked out.

I think people it the U.S. call silicon chalk. They also measure things with thier feet. Weird place.

Take a cotton pad (like for removing nail polish) make a baking soda paste with bleach lay them on top then let sit overnight

Pull a length of toilet roll off. Roll into a long tight strip along its longest edge. Get a pair of rubber gloves on and pour toilet bleach along the tile grout which has the mould. Lay the rolled toilet roll over the top of the bleached tile grout strip, and using your finger push the rolled toilet roll strip into the tile grout so it makes good contact and sticks to the bleached grout. For good measure you can run more bleach over the top of the toilet roll strip. Repeat this process until all mouldy grout is covered. Leave minimum overnight but ideally 24 hours. Remove toilet roll strips and wash bleach from tiles.

The idea here is simply to bleach the mould from all the white grout lines between your tiles. The rolled toilet roll strips, effectively soaked in bleach, help ensure that the bleach remains in contact with the grout lines for all that time and doesn't just trickle off. It keeps an even and moist coverage, allowing the bleach enough time to kill and also bleach the colour of the mould.

It's a pretty effective life hack, but may require a couple of goes for heavy mould.

fungicide, mold killer.

Not bleach. It’s not actually that effective; we just think it is.

Vinegar isn’t particularly bad for glazed tiles (it’s disastrous for natural stone, especially marble, because it dissolves it). And it can kill some bacteria, but obviously not enough.

Be really careful mixing chemicals, especially bleach. If you plan to use multiple products, make sure to flush the area well with water and make sure the space is ventilated. Even so, it’s still not advisable.

There are dedicated mold products that can work, but they will degrade your grout over time. I would recommend professional cleaning and sealing which will run you a few hundred dollars, but is well worth it, IMO. Maintain it over the years, and your shower will look fantastic.

If your caulk is moldy as well (as often happens), it’s much easier to rip that out and recaulk your tub. You actually don’t want caulk at all, you want silicone, which you can also get with mold inhibitors. Keep corners clear between showers so that water doesn’t pool, and if you have a fan or a window, utilize that during showers / baths.

If this is a rental, stick with the mold killer spray, using a fan, and moving items out of the shower when you aren’t using it. Shampoo bottles, loofahs, etc. are all breeding grounds for mold.

e: Just to be super clear for anyone else reading, do not mix bleach with ANYTHING. Vinegar in particular will make chlorine gas when mixed with bleach. Do not mix bleach, but it’s never a great idea to mix cleaning products in general.

You can also make a paste with bleach and baking soda. Once the mixture can stick to the grout line, you can apply it to all of the moldy or grimy areas. Let it sit on the grout for an hour, then rinse off. Make sure you have great ventilation in the area you apply the bleach mixture.

I tried using bleach, vinegar etc. Then I just went and bought a commercial product, totally worth it. Designed just for mold and mildew, soap scum

Lysol bleach foaming shower spray .

• wet shower , spray on desired area , spread with damp scrub daddy , wait 10 mins , scrub and rinse .

Don’t mix vinegar and bleach it creates chlorine Gas

Also it may take more than one round of scrubbing over multiple times to fully lift the mold . It’s perfectly ok to work on the problem areas alittle each time you clean . This is basically what a maid service would do if you hired professional cleaners .

Tilex

Krud kutter is the one I got.

Not saying it’s the best way to clean but if you’re looking for an easy, fast way to do it buy the bleach cling gel toilet bowl cleaner. Put that on the grout between the tiles. Let it sit 30 min to an hour. When you check on it, all the mold will be gone lol. You may have streaks at the bottom of the tub from the bleach running down. If you do, you can use a magic eraser after you’ve rinsed off the bleach. It’ll get the marks off.

Get a grout brush.

Try Killrock mould remover, spray on and leave for 20 mins then clean off

Get more air movement in your bathroom. Run the fan longer/open a window/leave the door open. You can find a caulk to match your grout and just run a bead over the cracking tidy it up and call it a day.

Recaulk.

Mini/countertop dehumidifier along with timer on bathroom fan switch.

Thanks, all!

I’ll do a little YouTubing to make sure I’m following directions from here correctly, this is helpful!

It’s not caulked at all and needs to be at all corners,it’s probably already leaked behind.

1. no one can tell you this because you didn't say how often you clean, how you clean, how many people shower in this, etc. 

2. remove the grout from the corners and where the tub meets the tile. Caulk it instead. Spend some time on YouTube looking up how to do these.

Finally there are 2 alarmist comments about how water is behind there and that's bad. If this shower wasn't done by someone totally incompetent, it's fine. Grout and tile are not waterproof. Waterproofing, kerdi board, or some other waterproof option goes behind them when you build out a bath/shower. 

The tile and grout are porous. They get wet then they dry. You're getting extra water in those cracks that never really dries and contributes to mold. However if the bathroom is wet pretty much all the time, caulking will help but you'll still have to clean regularly.

Someone JUST posted a great cleaning tip 4 her grout, may work for this. Scroll thru the thread.

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for that grout on the wall, check out this video

Lots of scrubbing with a powdered cleaner like Bon Ami. Once clean get a sprayer and fill it with 50/50 bleach water. Spray on the tiles weekly and it won't ever get that bad again.

Alternatively: Scrubbing Bubbles is really chemically but if you aren't sensitive to smells and have good ventilation you could cover the walls with that and follow the directions. It works well but I'm allergic to the scent.

https://preview.redd.it/zexvx4y7twof1.png?width=1205&format=png&auto=webp&s=a1ed2d65440f67de5a3c5432c5a810e09564d868

I’ve had the same issue. This Mr. Muscle Mold and Mildew remover does wonders. Spray generously on dry surface and rinse. Repeat until they’re all gone.

Soak bath tissue in bleach, apply where the mould is along the caulking, leave overnight. Works pretty well for me.

anything that keeps bleach on it for an hour or so will remove the mold you don't need to replace all the caulking.

Not just easier,  cutting it out, bleaching, and recaulking is all you can do. Nothing else will work.

You absolutely can. You need a strong bleach and to let it sit, if need be lay some toilet paper and soak it. An overnight soak will remove pretty much much anything, but a second app may be needed. Cillit bang black mould remover does the job

I use mould and mildew remover ( I like astonish as it’s vegan ) soak cotton wool pads in the M&M and place on the grout/ silicone and leave ( I normally leave for as long as possible ) it always comes up clean. Remember use gloves and open a window as it’s need be used in a well ventilated area. Close the door if any fury friends to stop them going In

We had a flood in our basement once, and the insurance company told us not to clean the floors with bleach, because it can actually feed certain kinds of mold. So I guess it depends on the kind of mold you have.

Soak cotton coils (beauty supply store) in bleach and leave them on the grout for 24 hours. If that doesn’t clear it, nothing will (at least in my experience).

Baking soda, vinegar and elbow grease. Make a paste and scrub the hell out of it.

If it’s not too bad, a spray like Dettol Mold Remover left on for 15 minutes before rinsing should work. If it’s bad, form a paste with baking soda and bleach and get scrubbing with an old toothbrush.