Yikes!!!.
I NEVER leave my scope outside overnight unless I end up sleeping with it!!!. I only hope your scope never got any moisture inside the tube, otherwise it's going to take some doing to get it all out. Check to see if you have any condensation behind the corrector plate. If you do, DON'T take the plate off!!!. Just remove the diagonal and such from the backplate of your scope and expose its insides. Don't put the dust cap back on. Let the air get to it for at least a day or so. Then replace everything. Then, get some silica gel packs from a camera shop and pack them into your JMI case.
You can get wipes for eyepieces and lenses but the best way to get the dust off is to use a blower to remove the dust...then put them back in their cases.
And...the best way to take care of your scope??. NEVER leave it outside exposed to the elements, again!!!!