Nope, not the only one!
Stan has two great loves in his life, footballs and washing machines. When he arrives at either of his grandparents' house, the first thing he does (LONG before saying 'hello') is make the sign for washing machine, and goes to check on them. In our garden, he takes a break from football to have me hold him so he can look over the fence and see the neighbour's washing machine (they have a glass back door). Going for a walk to the corner shop is an activity that is currently on hold because if we don't visit the laundrette (a detour), there is a big meltdown. This morning I found a sippy, two cucumber sticks and (yes) a football in our machine, waiting to be washed.
I thought it was genetic, Stan has a cousin who was(is) obsessed too. Aged about 3 he was playing on a beautiful beach in the south of France, and his aunt asked if he was having fun, and he said 'Yes, but can we go home and see the washing machine now?'