1. Use a fixed-dose pump
A securely fitted pump can deliver a repeatable amount. Once the correct dose has been established, count the number of complete pumps needed for the usual wash.
Everyday problem solving
The most useful method depends on the person’s vision, grip, bottle, washing machine and usual routine.

Need more than one tip?
A tailored response can consider the person’s vision, equipment, grip and routine together rather than treating each difficulty in isolation.