
A normal reaction from a wagtail newbie!
I thought exactly the same. The rubber is superb BUT you can only use the very lightest of pressure on the glass. Try it again but this time with a gentle hand, any harder & it just streaks!!
Unger mop won't work, the best tip was from macmac on another thread- buy a floor mop from Lidl,(blue & white, £2.99 each) it's the perfect flipper pad, it really is.
It will take time to master it but it's the best piece of trad kit I ever used.