Bike grease is generally a bit more tenacious than olive oil.
Can you wash greasy rags in the washing machine. Add the soiled dish rags to the washing machine. Some people might think that you should throw the rag away after it absorbs oil but to those individuals I say not so fast. Wash on the hottest cycle setting.
However keep in mind that your washing machine tends to become very dirty from the grease in the rags. To use vinegar add ½ 1 cup of white vinegar depending on the size of the load along with your regular laundry detergent. So I do not wish to dirty up my washing machine risking life and limb by washing my greasy rags in it - last time I did this in our old machine the scum layer took a lot of effort and about 10 empty wash cycles of water and various cleaning agents to clean out.
Reality is that they arent going to be dangerous if all youve used them for is cleaning not say filtering gas. You can wash it by hands or use washing machine to do the job whichever you prefer. It doesnt really come out with just a soak in soapy water.
This can prove to be harmful to future clothes. Much of it will remain inside the fabric making it dangerous to dry in the dryer. No ill effect the washer or the rags.
Use hot water to wash. By the way similar instructions are MANDATORY on all washing machine user manuals sold in the USA and also a warning sticker must be on every tumble dryer sold here. Answer 1 of 4.
A towels and jeans load. As a retired Firefighter we were always told not to wash oily rags in a machine then dry them. SG recommends it and it always works for me.