You can use your own icon (a PNG or JPEG image file) for your Extra on the cleaning booking form:
Overview You have the option of setting these items as “This Booking only” or “every booking” on a recurring booking: Extras Tip Price Adjustment This is useful when: the [...]
Go to Settings -> Extras Click Add New Enter values for Name and Price. Click Save.
Overview Extras are additional items customers can select, that are outside the scope of the service you provide. For Extras to appear on your booking, you need to make sure your Extra is linked [...]