My 2021 LC500 convertible just passed 10k miles (and 18 months of ownership) and water no longer beads on the fabric top. It has rarely been driven in the rain and is kept in a garage. For the few times I have washed it, I used 303 top cleaner .. gently. Of course, 303 also has a top sealer, but I figure that the choice of a sealer is much more critical. I have looked around for the best sealer treatment for fabric convertible tops in general. There doesn’t seem to be a consensus. I certainly don’t mind paying a premium for the best sealer. Any recommendations?