I don't do an awful lot to repair my cars myself, but I'm hoping I might be able to sort out a windscreen wiper problem without having to take it to a garage. A couple of months ago, my wipers got increasingly 'lazy', doing fewer and fewer wipes and not making it all the way to the 'home' position. I read that the first thing to do was to give everything a good clean, and that got them back to normal very quickly - for a while. It started again a month or so later, and cleaning sorted it out again. Now though, it's happened again, and cleaning makes little difference this time, nor spraying the pivot point at the base of the wipers with WD40. They generally make it to the top of the first wipe and halfway back down, then stop in the middle of the windscreen. Wait 30 seconds or so, and try again, and they go back down, up again, and back down to the middle of the screen again. I've been advised this might be enough for someone experienced to suggest whether its the relay, the wiper motor, or something else entirely. Any suggestions on what the problem is likely to be, and whether it's simple to sort myself?

Thanks,

Sam