Obsessive wiping and mopping around the shower tray after you've showered so that not a drop of wtare remains.
Everything in the fridge being decanted into tupperware containers.
Having about eight million different types of laundry detergent for every conceivable different type of fabric, wash temperature and so on.
Obsessive buying of household gadgets like steam cleaners, floor sweepers, mops, and so on.
Akchewerly I must confess to being a bit wierd about some things too - I like my sofa cushions just "so" and I do like a tidy house although I don't always manage to have it that way. I also have this thing about the house looking "nice" when DH comes home from work with no toys etc out, so will rush around like a mad thing tidying up just before he comes in. I draw the line at greeting him with a G&T though.