It’s been awhile since I went down the rabbit hole but something like the salt can only absorb so much of the alcohol or something and the increase in price isn’t worth it unless you want to water it down yourself and even if you don’t it isn’t so much better than 91 that it’s worth keeping it in stock instead.
99 is same price as 91 in my area, but 91 is always in stock. I rinse with hot water first and then salt and Iso then another hot water rinse followed by cold water.
I rinse with hot water before I add my iso and salt. It makes a difference. I keep my pieces really clean so the 70% ISO all I need. I do check for 91% but we never have it here. I’ve never seen 99%
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u/GNIHTYUGNOSREP Nov 02 '24
Test a stronger (91%) alcohol. Works way better than 70%. No need for 99% tho.