My personal truck sits around for weeks at a time while I am busy using my work truck. It's in a heated garage but something is dripping from the attic access panel onto the truck. I washed it and it won't come off, looks like it stained the paint. It might be something like rust stained water or...??? It is only a few drips but of course it is right at eye level on the drivers side rear door.

Does anyone have any advice about which cover to buy? Here is a link to one that looks nice for the cost.

Ultimate Shield Truck Cover With Camper Shell SuperCab Short Bed(6.5 ft) with Camper Shell 2013 F-150 Ford Truck Covers at CarCovers.com

 

I'd be looking for the source of the drip rather than a cover. There is nothing I can think of that would drip from a ceiling that is not going to be a bigger problem soon.

If it is water dripping, the cover you are looking at may help keep that off. But if it stained the paint, it may be harmful to the cover.

All that aside, looks like a good cover for the money. I like that it breathes…would keep the truck from getting moldy smelling.

 

Sounds like it may be tannin leaching out from a rafter or joist. A little condensation is all it takes to drip onto the truck. Although more prevalent in hardwoods, if the garage framing is doug fir or southern yellow pine...I've seen plenty leach from both. The good news is it should be water soluble. Try rubbing with a soft cloth wet with hot water. If there's still some residue, adding a little baking soda to the hot water should raise the ph enough to get it right out.
All of this assumes its tannin but I've seen it often just as you described.
x2 on making sure you get a breathable cover.

 

Thanks for the info about the tannin leaching out of the wood. The roof is in good shape and I don't ever see any moisture accumulate on the floor of the garage.

I was able to get some of the drips off of the window galss with a little spit on my finger...I'll try the warm water and a little baking soda on the paint tonight.

I'm not sure of what the roof trusses are made out of, this is a 70's modular home sitting on a basement foundation. I'll try to climb up into the attic and see if I can find any place that the moisture is comming from.

I've been putting a padded moving blanket over that portion of the truck. It's a pain getting it in place and I now think a full cover would be even more of a hassle to put on and take off.

Thanks again!