How to get rid of dust inside a projector?

[Anthony]

Try a company that sells fibre glassing supplies as they also sell Acetone as a the solvent for removing it. Your internet search engine is your friend here.

You'll also find it in 1 litre bottles through this source.

At least that's what happens in the UK.

One of my friends works at a company that supply's fibreglas and ground tubing for the data/telecom industry.
I will ask him if they stock the stuff.

DSLI_jon has a point.
I don't own a 3K cambridge set with high quality mirrors... my Dichro's are the new Laserwave dichro's so again not 300$ dichro's
I am planning my build to be under 5Watts so no "look at my bigballs" mega power level Cubr's or laserscopes.

[kecked]

I have not tried this but it seems it should work. If you seal up your projector as best you can and then put a small fan with a filter on it set to blow air into the projector, the projector will be come very slightly presurized. That should be enough to keep dirt out and especially for keepinf fog out while it's being used. Then when not in use, put it in a storage box or plastic bag.