I use an old soft toothbrush & really mild soap for the cracks & crevices. For the big areas I think its just like your house. I do a wipe down everytime I drive her & a heavy duty cleaning everytime I was the outside. My XF isn't a daily driver & that helps a lot. The steering wheel gets the worst of it, but I have had mine refinished 2x already. I am about ready to have it done again. Seems to be a once a year thing - costs about $40. Totally worth it in my book!!!