I too had the same problem with my rear wiper,the wiper would hardly touch
the window, but I have since corrected the problem without spending a
dime.
If anyone is interested in a 5 minute corrective fix for this problem I
would gladly send via your email a detailed step by step instruction guide
for a small fee of $5. This repair is simple and will allow the wiper to
wipe the entire blade length of the widow and has worked on 3 different
year Ford Explorers to date.