The white plastic brackets that you screw on the bottom of the faucet to secure it to the sink were apparently puttied/caulked onto the thing (ppl who did the plumbing in our house were not too bright). We've tried everything to get them off so I can replace the leaking faucet. Is there a tool for those or something to loosen the putty or caulk or whatever it is they used?? HELP!!