How do I make sure my shirts are clean after washing?

I am sorry you are having this problem. You might consider changing to a liquid laundry soap. If you are currently using a liquid, than try a different liquid. I have found that Xtra, a fairly inexpensive laundry soap, has been the best for everything. Good luck Fred.

If you use Regular detergent run the washer in full wash and add your detergent then add your clothes. If you use liquid detergent pour the detergent into your washer and start your washer and then add your shirts. Apparently you are maybe using too much laundry soap. Hope all this helps you and Good Luck with your laundry!!!

If you're using powdered soap put it in the washer and fill with water before putting the clothes in. Most spots are due to too much soap.

Wash it with a little baking soda with the washing powder or liquid you currently use.

If you use a good detergent, proper water temp. than you don't have to worry your clothes are clean after washing them.

white patches are due to excess soap.

do use less amount of soap.

No clue!