1)We invite visitors about once a week, makes sure we do the bathroom etc properly!
2)About once a week
3)I don't think I've had a chance to choose to change it yet - normally has some kind of fluid (milk/water...or the rest) on it at least once a week.
4)Have never... it rains, doesn't it?
5)Last time we needed a pickaxe, will do more often - six monthly?
6)Always put it off as long as possible (until MIL came to stay, in the hope she would cook loads) until I found something that really does 'do what it says on the tin'. Slap it on, leave for five mins, wipe clean feeling like I'm in a cleaning advert! Now do as soon as it gets grubby.