The r/lego wiki on the side actually has a post about cleaning Lego that you might find helpful.

Lather up a small amount of plant-based, fragrances-free dish soap, in slightly warm water. For pieces that have a lot of dust and finger oils stuck to the surface, gently scrub with a soft toothbrush. Rise several times in clean water until soap bubbles are gone.

Shake water off pieces (or use salad spinner) and place them studs-down on a microfiber cloth or paper towel to air dry overnight. It is helpful to position pieces so that spaces that trap water are facing up if possible to facilitate evaporation.

��I use a tiny bit of dishwasher soap, soak in a bathtub of Luke warm water for 4 hours. ��Stir every half hour. ��Drain tub and rinse with cold water. ��Place on towels with fans on it overnight.

https://www.google.com/amp/s/amp.reddit.com/r/lego/comments/2grjvt/cleaning_lego_a_quick_overview/

My method:

1. Break down al the pieces and put them into gallon ziploc bags about 3/4 full.
2. Two squirts of dish soap, then fill bag with warm water and seal.
3. Let sit overnight.
4. Drain water out of bags and spread pieces out on towels to air dry for at least 24 hours.
5. Move pieces around during drying process so none are stuck together.

I often just disassemble and reassemble. Cleans the set and you have the fun of building.

At this level of dirtiness I would personally just completely take it apart and wash the bricks with warm soap water and a rag, then let them dry for a day or two (not on direct sun). Put the stickered pieces separately and wash them gently to preserve stickers.

If it was slightly less dirty (read: more dust and less sticky) you could simply shower it, but the hard dirt that seems to be stickied on the bricks won't go like that.

For gentle mainteance every few weeks a can of air (or electric air duster) and brushes will get the dust off.

There's a whole cleaning guide in the side bar

Warmish water and an electric toothbrush

Lightly warm water and soap

For small pieces I use an electric toothbrush.

I just did this, and let them soak in warm water and pomolive dish soap (it’s the brand we had in the kitchen lol) let ‘em sit for 2-4 hrs or so and then spread them out on a towel to let them dry. It seems to have gone pretty well! They are a lot less dusty for sure! Used a colander to rinse off the soap water.

In all honesty, I don’t do it often enough, but:

• Cheap make up brushes (got a set with different sizes)
• Hand-held air blower (small; intended for cleaning keyboards and such — canned air probably works fine too)

Good luck!

I disassemble, wash, dry. Reassemble.

Building is the fun part of lego.

I have a set of dusting brushes of various sizes that I think are very similar to makeup brushes

Makeup brushes!!! They work wonderfully (i got after a suggestion on FB)

Thanks so much!

I use a car detailing brush, but have a handheld vacuum there so I'm not just moving the dust around.

I use a makeup brush, then I blow off any remaining with compressed air, and I think the key is running an air filter in the room and full blast for the day you do it. Blowing the dust off just means it will resettle in a few hours, the air filters gets the majority of it before that happens.

If you do it once a week compressed air works. But it needs weekly maintenance

Water is going to leak in-between each and every piece, and then when left in the dark and without much ventilation... yeah you're going to wind up with mold after awhile. At the very least some stinky gunk.

I have a fine mesh laundry bag. I disassemble, then put in washing machine on delicate cycle. A small amount of mild soap. Works like a charm!

A makeup powder brush (that was never used for makeup!). If I dust once a week there's never any build up, so then I don't have to wash them.

Soft bristled small paintbrush works for dust.

Soap water toothbrush for dirt.

I use display cases from unique display

Power Washer

U clean them?!

I use a toothbrush to dust.

I use eyeshadow brushes or kids’ watercolor brushes.

Canned air

Silly putty

A soft paintbrush can help dislodge dust.

A vacuum cleaner with tights over the hose can vacuum up dust, and will catch any bits of Lego unfortunate enough to be broken loose.

I run a bricklink store put it in a mesh laundry bag then put in washer with alittlw detergent. That's how I clean bulk and anything that dirty

A little simple liquid soap, warm water and toothbrush. For that level of dust/grime, that will be the quickest method (cleaning with compressed air won't be enough and cue tips/paint brush will take forever). If you do wash the pieces, buy a salad spinner, works great for drying pieces quickly.

Serious answer, take it apart, run the pieces through a salad spinner with a few drops of dawn, drain salad spinner and spin another 30 seconds to get rid of excess water, lay out on a towel overnight. I assume this is the Death Star, it’ll take 9-10 salad spinner loads and two towels to lay out. The next morning, you’ll have clean, dry legos, put it back together or sort pieces and store. I had the big 2012 R2D2 spill out of the box in my attic and the pieces sat there for 12 years. I finally got all the pieces together and used this method a month ago. Put it together good as new

Take apart. Soap and water. Dry. Rebuild

Pressure washer on high

Throw it in the washer

I use custom designed plexiglass cases. For those not in cases I use camera cleaning kit of brushes and hand squeezable blower.

Hahaha!!!... I don't 😁✌️

i use a fluffy never used makeup brush!

Keyboard vacuum and big makeup brush

make-up brush, no compress air just that, it gets everywhere and every dust without putting a force at the lego pieces or figs