Anthony here from Hood Cleaning Helper.com 
This week’s hood cleaning tip I want to deal with filters. If you do clean the filters for your customer, I hope his tip helps you get those filters sparkling so your customer will think you are the greatest thing sense sliced bread.
The first thing you want to do is pull the filters out of the hood before you get it wrapped.
I use an 18 gallon Rubbermaid tub that I got from Walmart for like $4. I actually have a couple of them in case there are a lot of filters. What you want to do is put about a cup – 8 oz – of dry caustic in the bottom of the tub. Using a hose, start filling the tub with COLD water until it’s about 3/4 of the way full. I sometimes put a little bit of Dawn or other surfactant in just before I turn off the hose. It will help separate the grease from the surface a little better.
Note: Your mixture for this does NOT have to be strong. Dwell time will be on your side, so you don’t have to have really strong chemicals for this.
Next, put in the filters all the same way. Now, leave them sitting for at least 10-15 minutes before their first rotation. Then every time you walk by them, just rotate them a quarter turn until you have gotten all sides. When you take them out to rinse, the grease should come off easily and save you tons of time with a pressure washer.
Now, be sure to neutralize your dirty water before you dispose of it properly. Another thing to consider for this is if the filters are galvanized, the chems will turn them black. If the filters are aluminum, there may not be filters left when you go to take them out of the tub. Caustic eats aluminum!!! Be careful.
Hope this tip helps, be on the lookout for next week’s tip. If you have any suggestions for tips, feel free to email or just post them in the comments below.
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