Scentless itself is a problem.
While many things are in pure form without scent, once they come in contact with dirt and bacteria, biofilms build which create own scent. If you like smells, you know that you need to test parfum on your own skin, not on neutral paper because it really changes dependent on skin. If you sniff materials in close distance, you will be surprised how many things actually have a scent: plastic, metal and wood.
So even if your body would be scentless, the bacteria and microorganisms living on your skin create scent (in fact we need those microorganisms on our skin, we live in symbiosis, they shield us against hostile organisms).
Skin varnish: Use some spray to build up a transparent, dull layer on your skin. Your skin does not need to breathe (Goldfinger is wrong in this regard), but it is also not really benefical to your health and it will be very uncomfortable if it is hot. Could be used to suppress your scent for hours.
Change scent: Once genetic engineering takes place, you could change the own smell and perhaps easier, sterilize your skin and repopulate with another composition of microorganism.
Android/Cyborg: The closest possible approach, replace your biological components with perfect mechanical doppelgangers without scent.