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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
In my shop I usually use Happy Camper Extreme Cleaner. I have had the best success with that. Don't put any grease in the gray tank and that will help keep this from happening. I am adding a link to that product on Amazon. Totally "green" and not expensive. I suspect that you just don't see the third handle. It may be behind a tire and it won't be in the same place as the other two. See the attached link for that. https://www.amazon.com/Happy-Campers-Organic-Holding-Treatment/dp/B005XEFADU/ref=sr_1_3?ie=UTF8&qid=1503583895&sr=8-3&keywords=Happy+Camper
Please get back to me if you need more later as all follow ups are included in our fee.
Just following up to see if perhaps you missed my earlier responses to your question? Easy to do considering the volume of e-mail that most of us get every day! If you need me to resend it please let know. Thanks!