Just rinse with water and that should be ok. However, you can also do the following:
- Fill the tank part way and then run the sprayer
- Next, fill the tank part way, and then add in a cleaning agent (dish detergent works fine) and the run the sprayer, again.
- Again, fill the tank part way and then run the sprayer.
Remember to treat the flush water as chemically treated, and don’t do this in your yard, you might not be happy with the result.
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How To Clean A Sprayer After Using Roundup
Round up itself is a good tank cleaner and will get rid of all traces of 2-4D if there are any in there from your yard spraying.
That said, it still needs to be removed before you go back. So, rinse until you don’t see any bubbles-fill up part way, sides of tank, slosh around to get sides and top of tank, then dump/pump out and repeat.
Ensure you flush any agitation/return lines, hand wands, booms, pumps, and hoses during each step.
DON’T USE AMMONIA as that would be asking for more problems than any benefit with the use of round up. That is because ammonia or bleach is not eco-friendly, will causes stains and it’s fume inhalation is not good and will ruin your clothes.
It is not needed to clean the tanks, in my opinion.