This is a REALLY simple tip I find to be excessively helpful in our home:
Color coordinate your washcloths.
This sounds really silly and over the top, but I promise, it works extremely well! We use washcloths for just about everything in this house, as we don't typically use a lot of paper products. A few of the things we use washcloths for are: cleaning the bathrooms, cleaning the kitchen, cleaning the floors, wiping down messy baby faces, dusting, and at times, even as a napkin during a meal.
Now, I don't know about you, but no matter how clean it gets in the washing machine, I don't want to use the same washcloth to wipe my child's face that I used to clean our toilets last week. So, I color coordinate.
Typically, I try to keep all the white washcloths for less offensive tasks. That includes wiping little man's face and hands, cleaning crumbs off the counter tops, etc. Another color I use for a specific task is that any yellow or brown washcloths are bathroom washcloths. That is, um, kind of gross, I know, but it is a really easy way to remember what color is which. And, it's a really easy way for DH to remember as well, since he is a great husband and does almost as many chores as I do.
When you're trying to initially set up your washcloths for the house, one easy way to remember is to leave the washing instruction tag on the washcloth, but draw over the text or pictures with your own picture, such as a drawing a toilet on the tag with permanent marker. It's a visual to remind you what that color washcloth actually does.
Again, this may be really over-the-top, but I find it works well for our family!