Cleaning old paint bottles

Anyone know of a good way to COMPLETELY clean old Tamiya and other paint bottles? I can sort of get them clean with water and some thinner, scrapping the sides and all, but it never gets completely clean (so you couldn't even tell there paint was ever in there). Most of my used bottles are X-18 since I go through them very quickly. Any tips greatly appreciated.

IM not sure if it would work or not but what about soaking the bottle in some Castrol super clean.. It gets the paint off our car so why not the bottles.. Other then that I would say just thinner..Later Rick S

Yeah, that crossed my mind as well. Unfortunately I am all out of CSC, and I don't feel like dragging my ass to Wal-Mart at 2am to get some. I'll get some this weekend, need to make a trip to my LHS to get more X-18 anyway. Anyone tried CSC to clean out bottles?

Why would you clean out bottles?

Why would you clean out bottles?

Sometimes I'll mix colors based on Tamiya instructions or a custom color just on a whim while messing around. Old bottles let me mix a lot of it for use in future projects in case I find a combo I like.

I just put some paint thinner in it, and shake it alott.... and scrub the inside with some paper towel and mine comes off.:iceslolan

I did the same with my old airbrush bottles: They wer filled with enamel paints and hadn't been touched in years, and some Testors thinner and Q-tips got them pretty well clean. I would check them again before I use them, but a little elbow grease should get them useable again.