My mother in law was quite uptight about shoe removal until one night she suffered a vein burst in her ankle. It looked like a scene from some horrific horror movie with blood spurting up the walls, soaked in to carpets from the kitchen, living room and the downstairs bathroom where she ended up.
We were there until 2am scrubbing the blood with packets and packets of salt.
Every now and again she diverts in to shoe removal mode but generally a quick reminder about the night her son in law scrubbed her carpets walls and floors until 2am realigns her OCD. She had them professionally cleaned and so didn't need replacing.