My son has a few sensory issues and one of them is that he does not like to get his hands messy, slimy, sticky, or dirty. I hoped that if I created a sensory activity for him that used his favorite toy cars and busses he might decide to stretch his boundaries as bit.
I squirted out shaving cream on an old baking sheet and hid toy cars in mounds of shaving cream and told him it was a "CAR WASH". I also gave him a spray bottle and fingernail brush. He was a tiny bit hesitant at first but my husband sat down with him and demonstrated how to retrieve and wash the cars and even to drive them around making tracks.
It ended up providing at least 45 minutes of fun!