Most items have tags on them that specify how they should be washed and dried.

In general, items can be machine washed and hung to dry. Some fabrics are "recharged" when when they are dried in the dryer, so an occasional drying on a low setting may be just what your garmet needs.

If you are looking to clean marks off of technical fabric, try Dawn dish soap and a tooth brush (remember to thoroughly rinse the fabric to remove the soap residue). Other products that might work well, and can be found on Amazon, are Nikwax Tech Wash and Granger's Performance Wash.