I use TFR as a degreaser on engine parts, it has been known to take the skin off your hands. It's how I clean the landrover engine bay, spray neat TFR around using a garden spray bottle then wash off with the preasure washer.
Have tried it on windscreens but without success, not used the scourer I admit which may be the reason for my failier.
The volvo screen wash I find very good at preventing streaks, in fact so good I use nothing else in any of my cars.
Paul.
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