Keeping clean isn't too much of a problem.
The danger areas are waist irritation from a sweaty waistband, the nooks and crannies in the nether regions and the eyes.
Don't laugh, but "Femfresh" products are worth a gander - soap free, fragrance free etc. Canesten AF (athletes foot) cream can help more than just the feet.
If buying wet wipes buy decent "clothy" ones - not "value" ones. Those with a slight fragrance will help morale after a patrol because you "smell" clean and fresh. Small niceties like that can really help your mental state after a patrol/during a tour.
Two items most folk forget are a set of decent nail clippers (for toenails mostly) and a nail brush. Untrimmed toenails can turn black on long walks/patrols etc - never mind ingrowing toe nail problems that might need attention now and then. Bites, cuts and scratches can easily get infected from a dirty fingernail and quickly turn into ulcers and boils.
Hope this helps.
Liam