We have been fairly successful at keeping skin issues under control with my 96 year old mother since it is so difficult to keep them bathed daily or even several times a week.
After the bath and a good towel drying, we use the hairdryer to eliminate moisture in every nook and cranny of her body. The bonus here is that it keeps her from feeling cold when the air hits her moist body.
Then, for the inevitable yeast/fungal rashes that pop up from time to time, we use a feminine yeast control product including under the breasts where moisture can get trapped and the germs can easily reproduce.
Finally, a good rub down with the favorite moisturizer, we use Jergens body butter with shea and oatmeal. I think the shea actually creates a skin barrier to help retain moisture. Have found the most expensive moisturizers and body butters just don't work that well on old skin. This works for us.
So far, we've had good results. It's really tough keeping their skin from breaking open and bruising easily, but at least this regimen, simple as it is, seems to keep the rashes and other skin issues under control.
Hope this helps someone.