you have OCD, in Arabic it is called وسوسة (waswasah).
Pray surah naas every day, and limit yourself to washing your body parts no more than 3 times.
Wasting water is bad. The Prophet (Saw) has said, "do not waste water, even if you are at a running river"
Also, the best example to follow is the Prophet (Saw), and the Prophet used to do Wudhu with one mudd (about 600 ml of water) and have a bath with a saa (about 2 litres).
You dont need to use handwash, water is enough. However, if you do, that is fine. In the Prophet's time they used to use عشنان and سدر which are a bit like modern day soaps.