Under Toughest Challenges on the De-Solv-it container it says to let the product setup for 8 to 24 hours. If I am trying to remove Silicone Grout from a vertical surface how can I do that?

It is recommended that you apply the De-Solv-it product with a rag or sponge to saturate the area/product to be removed. As De-Solv-it is an oil type of product it is not going to dry out, instead it will absorb into the Silicone and begin to break it down. Applying the product with a rag or sponge will minimize any runs to the surrounding area and also aid in removing the product from the grout.