The directions say to immerse the thing into a 12oz cup with 6 drops of dishwashing soap, but every video guide on people installing it shows them using a small spray bottle. What is the best way here? I have a small spray bottle to use, but how much soap would I put in it then? I'm a little confused as to the best method here. If I should use a spray bottle, can someone tell me how much soap to put in?(the size is like 1-2oz) Thanks.