[header] How to caulk a shower [title] Slice away old caulk. [step] While there are different methods you can use to. Get ride of old caulk by slicing it off with a razor scraper, utility knife, or five-in-one painter's tool. 
[substeps] Using quick, sharp strokes, slice through the length of the old caulk and peel off the majority of the loosened caulk using your fingers. Note that metal blades and chemical caulk removers can damage plastic tubs.