Hi, I used to have a cook who used to wash the utensils as well. Now she has left, and I realise that a lot of my non-stick pans have a lot of oil on them as she never used to clean them properly. What can be done for that? I have tried soaking them overnight in liquid dishwashing soap, but its useless. Any other tips? I am scared to scrub it hard as the non-stick coating will come off. Thanks.