Just sprayed a mix of Atrazine 4L, Diflexx, Halex GT, Weather Gard, Radiate, Tombstone, and some micros.  Water was the carrier; total volume was around 25 GPA.

Used the standard 16 and 50 mesh screens.  Everything sprayed fine.

Went to cleanup; took the filter housings off, and there was quite a bit of a white film.  The filters were mostly clean, except for some areas -- not horrible.  The film wouldn't spray off with just garden hose pressure; had to get a brush and scrub.

Ended up taking a gallon of Loveland's All Clear in about 75 gal and letting it run through agitation and the tank rinse nozzles; opened up all of the boom ends (poly boom), and ran it through it.  Then did two rinses with just water.  Looked in the tank, and there was still some scale at the bottom in areas.  Ended up doing All Clear again, but at a bit stronger of a dose in less water; didn't seem to make any difference.

I've seen some other posts that are way worse, but this is definitely a task.

I think the only thing I can do is just try a hot pressure washer on those small areas of the tank.

Hopefully the inside of the booms aren't like this.

Think it's not enough to really worry about?  The next thing I'll spray will be burndown for soybeans next year.

If I go with Atrazine and Halex GT again for the next corn year... does the dawn dish soap in the tank mix actually make a difference? 

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Atz and calysto.