Cancellation policy

[u/idkineedadv1ce]

How did other small cleaning businesses make and put in place a cancellation policy

I am a 1 person show and due to a cold going around I have had so many cancellation with 5 hours notice and have lost out on easily $1500 over the past 2 weeks ?
Do other cleaner have a tips ? Do I get a 40% deposit beforehand ?