Um sure. We don’t usually reply to people here with ‘use the search engine’ but there are a few good threads on it. I’ll give you the condensed version cause I’m a bit tied up at the moment.
What
@Outlier says is correct. You need to work with ‘anhydrous acetone’. Google ‘drying solvents’ for videos on how to make it yourself using hardware store acetone and epsom salts baked in your oven.
1. finely crush your meth. Don’t do more than a gram or two your first time until you are confident.
2. place your meth powder in a shot glass (must use glass) and cover with acetone. Fill to 3/4 volume of shot glass.
3. Stir briskly. Best to use a glass rod but a spoon is ok. Stir for 3-5 minutes crushing the meth further against side of shot glass with your stirrer.
4. Put an unbleached coffee filter in a the top of another fairly large glass. While still stirring tip the meth/acetone out of the shot glass into the filter.
5. Rinse the shot glass with a bit more acetone and pour into the filter. Another 2/3 of a glassful is about right. Scrape out any meth remaining into the filter.
6. Let the acetone run through the filter. It is full of dissolved cut and nasty manufacturing impurities and residues. The white powder left behind in the filter is your purified meth plus any insoluble cuts (which are not that common really).
7. Fold over / seal the top of the filter and hold and shake in front of a fan or hairdryer for 5-10 minutes to evaporate off the remaining acetone. You can also put the filter in a warm oven 80 degres celcius or therabouts for 10 minutes or just in the sun. When you can no longer smell acetone it’s ready to be consumed. But I usually leave it drying another 10 minutes or so unless I am totally fiending.
Your clean meth should be stronger, taste better and sweeter but will probably still leave a small amount of white residue in the bowl each time you finish one. Clean off with a damp Q-tip.
All up 15-20 minutes start to finish if you already have the anhdrous acetone. You can make up a fair bit of anhydrous acetone and store it in an airtight mason jar to save time next time.