I use mine every day for work. I use a bleach mixture with an orange Zep degreaser most of the time. But occasionally I'll use it for bug spraying, or use Simple Green in it. Over a while they do leak and won't pump or spray well. All you have to do it take it apart and clean it with warm soapy water. I've done both* of mine a number of times and after the cleaning they work and look like new. I'm VERY impressed with these units, especially given they are designed to taken apart & cleaned to return them to like new functionality.
If you use hard, minerally or dirty water in them, it will cause it to clog and need cleaning more frequently. I use distilled water in mine most of the time. Occasionally I need to use what I have on hand.
One other tip: near the pump rod opening on the top, where it says "oil", it does need to be oiled periodically. You know it's time when it does not pump up as well as it normally does. I use WD40 which is probable not the best to use, but its what I have on my truck. Triflow would maybe be a better choice, but I can tell you that silicone oil is NOT good.
Lastly, if the pump is left out and rain or water gets into the pump (where the oil would normally go), it does not pump well, or at all. But all you need to do is turn upside down and pump a few strokes to get the water out. Then oil.
I've never had a sprayer as good as this unit (and I use a lot for my work). This is a quality item, but like any quality tool, it needs periodic care & cleaning.
*I lost one some I'm here today to buy a replacement. They are over a year old and still work great after a cleaning.
The only negative at all is I wish they came in a smaller size as well. I could really use a 16oz size too.
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