u know the water beading isnt a good sign, what should not bead it should sheet off, because if it beads then it will get dirt in to the beads of water dry and leave lumps of dirt on your car.
autoglym does this and looks good to begin with but after a few days looks pap.
i use meguiars it is very good if u use it propperly, they do a 3 step treatment first step is the paint cleaner u put it on let it mist then wipe off once u have wiped it off the paint looks much better and if u rub ur hand on the paint its much smoother and squeeks, then is the wax which like the zymol stuff puts a protective barrier on it and takes a while but lasts well then u polish it to make it really shiney, the water then sheets off and will not bead on your bonnet.
i think it costs 30 - 40 quid for the full 3 step thing but it is worth it they also do a quick mist detailer that if u say go to a show and u have waxed car day before but on the way u got dirt on it u spray the quick detailer on and whipe straight off and it cleans the car.
zymol is also very good and also do a 3 stage treatment like the meguairs but each step costs 80 quid per product!!!!!!!
but its the stuff f1 teams use as clean paint creats less drag and makes u go faster
MalicE