I worked two days when I had to re-seal parts of my shower. Even if the silicone has been virtually completely removed with a very sharp cutter and only extremely thin layers are left (even on smooth, anodized aluminum rails), shows no effect. Despite triple contract and several hours reaction time the result remained without any success. The money can save you need. Maybe other brands are better or silicone remover works well only to the extent that it fills the wallet of the seller and manufacturer. However that may be, I will in any case buy no more.