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Just my two cents after reading some of the comments on here (and no, I did not read all the comments)…
The metering unit (injector) can easily be removed and cleaned out with water (you will see the crystallized DEF just fall off). It literally takes a few minutes under the car to remove it (unless it is caked up with urea which then just grab something to give it a few short twists to release from exhaust). Then use ISTA+ to run a spray pattern test to check if it is working properly. You can even run the ticking test to see if it is activating properly without removing (even if it's clogged up, you will still hear it activating via ISTA+ which means it is working).
If you have to empty out the tank, why not remove the metering unit (injector) and drain it out carefully using an air hose adapter.
Not trying to come off as a smart ass, but ISTA+ is free. Get on the bandwagon and mess with it, get to know it, run diagnostics. Anything you need to do with ISTA+ is pretty much "Search Text.. and boom (for everything in this thread just type SCR and it'll show you everything)". You are not gonna mess anything up in your car. Any tests, it literally tells you what it will do or what you need to do on your behalf to initiate. And, if you don't feel to confident, you can always X out to cancel said test.
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