How much isopropanol is effective but safe for viny?


I make my own cleaning fluid using isopropanol and distilled water but am aware that some think IPA is not good for vinyl. Since  the contact time is quite limited I think that it is probably OK to use a small amount as a solvent for greasy contaminants. What do you thing know is a safe level? 25  percent, 10 per Cent , or some other level??

rrm
I've used up to 25% with no problems ever, in the sense that cleaned LPs sound better, not worse, after exposure to my cleaning concoction.  But I ALWAYS use laboratory grade 98% isopropanol (also known as "isopropyl alcohol") as the basis.  Do not use rubbing alcohol or anything lesser than pure isopropanol.