What are some quick remedies to prevent odorous feet even after you keep washing them?

A few things: Wash your feet with an antibacterial soap. Use absorbent foot powders and antiperspirant sprays. Change sweaty socks midway through your day, and rotate your shoes often. If you have any shoes that are smelly, get rid of them. If these measures do not work, see a podiatrist.

Couple of things : You may want to try soaking your feet in dilute tea (tannic acid) to decrease sweat and odor. You can try certain dry which you can get at the pharmacy. If persists see a podiatrist to make sure there is not a skin infection.