Should the stickers on the ram slot be removed before Iso bath?

I'm not sure if isopropyl alcohol is the best thing here to clean cat pee.

You really need to look at the chemistry on what was spilled and then find the best cleaner for it. Straight distilled water is the my first choice. Then I add to it depending on what I need to clean (a little: baking soda, bleach, or vinegar). And, yes I still use isopropyl alcohol to clean off grease and oil residue and to leverage it's drying power.

Dipping the entire logic board into alcohol only makes sense if you got your system really wet with rain or fresh water. But thats after first dipping it into a few baths of distilled water to dilute anything thats in the lake or pond water.

As for the stickers as long as they stay were they where I won't worry. If they are loose then take them off for now. You don't want to loose them they have useful info on them for anyone servicing your system in the future.