You should not use isopropyl alcohol to clean the resin tank (vat). See the below for some directions on the recommended cleaning procedures for your tank.
To clean a resin tank, you will need to pour resin into a temporary, opaque vessel.
We recommend a disposable cup or other container.
Make sure to wear gloves and remove the build platform before removing the resin tank. Gently run the scraper over the silicone in the base of the tank to push the resin into the container. Wipe the sides of the tank with a paper towel.