This is slightly to the side but I prefer a bath to a shower and I've found that a very short time in the bath with hot soapy water lets me pull the sensor off with the greatest of ease. I only submerge it when it's ready to be removed, the rest of the time I have a moderately uncomfortable bath with my arm elevated. But the claim that you can submerge it for up to 30 minutes obviously doesn't extend to warm, soapy water. I haven't tried this with an active sensor and I don't think it would like it.