I see that you posted your question quite a while ago, and am surprised you had not yet received an answer. I just noticed your question and would like to try to help.
If you've been making excellent pizzelles with your Salton, over a period of time, your batter recipe is most likely fine. I think what happened is that the non-stick surface of the grids is wearing out, and that's why they're now sticking.
If the instructions tell you to spray the plates with a non-stick spray like Pam, before using (while it's cool, not heated), continue to do that, but don't use the salad oil, and this can cause the non-stick surface to erode. The cleaning you describe, with a soft toothbrush and mild detergent and water sounds logical, but only do this if the manufacturer suggests it. Even though the toothbrush is soft, it can be damaging to the non-stick surface.
If your pizzelle maker is a couple of years old and used frequently, the problem may just be a wearing out process on the surface of the non-stick plates, and/or the thermostat is not as accurate as it used to be.
Try this recipe:http://www.tablespoon.com/recipes/pizzelles/2/?utm_source=yahoo%2Bsearch&utm_medium=cpc&utm_campaign=paid%2Bsearch&utm_term=pizzelles/
It might be time to purchase a new pizzelle maker, if this problem continues.
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