Right, well, I got the chance to give this a shot today, seeing as the sun was shining and no clouds in sight. Didn't go so well...
Started off first by cleaning the car, usual car shampoo and a wooly mitt thing, just so I could see what would come off with the hot water. In general, the car was cleaner, but this "tree sap" stuff just wasn't shifting. Its been there for ages, I just kept putting it off.
So, onto the clay bar, And yes, the stuff starts to move....but slowly. Really slowly....given that the roof and bonnet was covered in the stuff. Got bored of that so went back into the house to see what else I could use.
Came back out with Cif Oxy-Action and a normal bath sponge (silly me). That Cif stuff really shifted that dirt, cleaned the whole car in about 20 minutes when got going. Used the back side of a washing up sponge (aye, the side with the rough scraping bit for pans) to clean up the bumpers as they are plastic, no paint, and have a textured finished.
At this point, I get the clay bar out again, and give the whole outside a going over. Car looked alright, definately a lot better that it had before, so run it down to a friends garage to use their power hose, to clear it all up.
At this point, I got a bit distracted, and decided to clean up all the rusty bits of the car, panels with little holes in them, stuff like that and...unfortunately a back window, the underside of the inside of which, which looked like some little monster had been slowly eating the panel. Sorted that out with Aluminium mesh stuff and Isopon P40, then a coat of P38, a sand down and a spray.
Now, I do notice that the outside of the car is covered in swirly paint marks when the sun catches it, no doubt caused by my over zealous of kitchen de-greaser and a crap sponge on the paintwork. So how do I clean this up?
I've got wax sitting here ready to go....should I get a good liberal coat of that on and see if the paint is noticable? Should I clear-coat the whole car?
Also, theres is little tiny cracks in the paint on the front of the car, only wee circles about 1mm across, which I'm assuming are caused by either stone chips, or that tree crap having ate the paint. Does T-Cut sort those out, or will I have to re-spray the lot?
Sorry the post is a bit rambly.