How do you safely remove dried Combat gel from walls, countertops and tile?

Last year an exterminator put that brown Combat roach gel all over my cabinets, drawers, under the cupboards and countertop in my kitchen. The product worked but now it is dry and crusty looking. I have tried washing it away with Brillo pads and spraying it with cleanser and it only makes a mess. It will not go away. I thought about painting it, but there are too many different types of white in the kitchen to match the paint right. I am afraid to use a chisel like one person advised because I don't want to damage anything in my apartment. When I look online for dissolvent especially for this product, I can't find any, but maybe there is something that is primarily use for something else that can get rid of this gel safely. Would anyone be able to share what they did to get rid of the gel that actually worked? Thanks for your kind and helpful responses.