Dwarf hamster has started peeing only in her wheel. How can I train her not to?

My dwarf hamster has always used a certain area or two in her cage for peeing, etc. She has always been clean like that and kept herself trained. The last couple of months though she has decided to use the wheel as her bathroom. She specifically runs to the wheel, jumps in, pees, and jumps out and goes about her business! Has anyone had success with those hamster potties? Or have a suggestion for what to do?

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