(Wow.. someone used correct grammar and spelling in their answer for once. XD I'm a bit compulsive about that... sorry for this comment interrupting your answer.)
When you get to Wimpy Wonderland, (on Poptropica, of course) you will need to run to your left, sliding across the snow as you go. You will eventually get to a store with some kids hanging outside it (unless of course you've completed the island and you chased them off). Enter the convenient store. Inside will be the man with the wiper fluid, which is a bright, antifreeze color in contrast to the black and white of everything else. ^__^
the store
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go find mannnyy
Complete all the other islands to get it
you take it to the tractor man beside the school
to hold wiper fluid later in the island
You give it to the guy with the snow plow.
you go play bingo and win the CD and put it in the radio
git the dog dish in rodricks room poor it into th
you have to use it to divide the Wiper Fluid for the Snow Plow Driver
He is the man next to the plowing truck.
The wiper fluid is needed by the man operating the snowplow truck to the right of the school, so that he can see through his windshield to clear the snow.