Ok, I want to seal around a sink in the kitchen. I've read the guides, watched YouTube. The advice seems to be to squeeze out a bead then spray various liquids over it and your fingers before running your finger along the bead to get it in all the gaps and give it a nice finish. Some people say window cleaner, some say washing up liquid. I've tried both and the bead just came off. The window cleaner people are using is alcohol based but I don't know if the stuff from the supermarket is the same. I've used washing up liquid but not neat (watered down). What's the trick?