I can't speak specifically about liquid oxygen drops.
Most folks on this forum use ozonated water or H2O2.
But assuming it bahaves similarly, then doing some
form of sweating will help the toxins come out faster.
If you have access to a steam sauna, use it as much
you can. If not, take hot baths with Epsom Salts .

I can't say I know from experience about oxygen drops either, but I assume they would be weaker than O3. Using those assumptions it will take longer for you to get through the rashes and stuff, and that can take months using pure ozone. My guess would be it will take you between 3-10 months. The more you take, the faster you'll get through it, but the worse the rash. So it's up to you. I like to just cruise along at a slower pace so the rash isn't too bad. It takes longer, but it's more comfortable.
Dr. Pressman says the best way to not get bad rashes is to do body cleanses first, especially the liver cleanse. I put miracleII Neutralizer on it if it gets real bad. It lasts a couple of hours or so. Anyway, good luck. I know how you feel. I'm doing my yearly skin cleanse now.