For meth it is very common to use denatured alcohol from a hardware store.
I used Klean-Strip SLX from Home depot for years. It had an acceptable amount of methanol, ethanol, and very little amount of the dirty stuff.
A few years ago the Home Depots on Oahu stopped selling the SLX and now only seem to sell a can from Klean-Strip labeled just denatured alcohol. The MSDS isn't exactly the same but I have been using it for about 3 years now without issue.
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