I let the bottle soak for a good 24 hours in a bucket with Dawn soap.
But I stopped using the Zaino bottles. They are wasteful, hard to use and hard to get those thin coats you need when using Zaino or other sealants. I can get about 3 coats from about 15cc's in a 30cc syringe. I use a 30 cc medical syringe that looks like this:
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I pour the Z2p or Z5p into the top of the syringe. I make sure the end is plugged with a small nail. I mix with ZFX if I need it. Squirt a couple shots of Z8. I then mix it all up and reinsert the plunger. The syringe method is much better for applying those thin layers of product onto a terry cloth applicator pad. Right from the syringe I squirt a very thin line the shape of a "M". With practice you can get about 5cc's per coat.
You waste very little product that way vs. the Zaino plastic bottle method. You might waste 1 little drop with the syringe.
Cleaning is a lot easier. I let the syringe and plunger soak in a bucket with Dawn. I draw in the sudsy solution back and forth with the syringe and plunger. It's completely clean after about a 4 hour soak. Plus you can get these 30cc syringes from many sources.
**1 oz. is approximately 29 cc's.