Couple things here... 90mL in 90L = 1:1000 ratio. Also SO2 is a gas. As a wine additive it typically comes in powdered form as potassium metabisulfite or sodium meta. Or it also comes as a gas - very noxious and tricky to dose without the correct equipment. On occasion it can come as a liquid but I think this is pretty uncommon anymore. If you did buy it as a liquid it can come as 5% or 10%. So it’s pretty important to understand what you’re adding to your wine. A typical free SO2 that you might find in a wine may range from 20-40 mg/L - that’s as SO2.

Without knowing what you’ve added I’m not sure I can be of any further help. If you added a different sanitizer such as peracetic acid it will make the wine taste terrible. If you added a tiny bit of liquid SO2 (like you appear to have) it will make almost no impact on the wine (90mL of 10% PMS solution to 90L of wine Is a very small addition).