Get a $13 pump from Harbor Freight and pump it dry. https://www.harborfreight.com/battery-operated-liquid-transfer-pump-63847.html

 

Good idea. Can't see in the bottom to know if I got it all or not though? brian

 

Don't put bleach in it.

Can I put a small amount of bleach in the reservoir without hurting anything and would this do anything? Only thing I know to do is take it somewhere and have them remove the drain and clean the reservoir?

Thanks.

Brian

Forget about bleach. Remove the reservoir, clean and reinstall is the remedy.

 

Take off like 2 screws, under the undercover, pull the hose off the washer bottle and let all the fluid drain out. Looking from the underside you should also be able to see the gobs of mold.
Its really easy to access the jug from underneath and not nearly as difficult as you might think.
A Youtube video of any Toyota will be the same basic structure.
If you cant get anything out this way do like Phil said and remove the whole thing and clean it out.

 

If you can't remove it, Only suggestion I have is to push a hose into it and flush out the fluid. All of it.

 

Another option is to use a shop vac that is made for wet use. You may have to make an adapter to use as large bore flexible tubing as possible to pass it down into the reservoir. Refill partially with water and repeat suction a few times.

 

Had the shop clean it out cost me $160. Oh well....Brian