can it be used inside to clean tile and grout

I would not recommend using a powerwasher indoors, but if your tile and grout is outdoors I do not see why not.

Can this be used on windows?

Have not used it on windows, but think it would work.

Can i use this brush with my k2 chk?

As far as I recall, it is for the follow behind unit

Could I clean solar panels with this brush? Or the brush bristles are to Hard?

Hello from Karcher! We always recommend doing a spot test when cleaning a new surface type to make sure that the device cleans the area as you wish. I hope this helps, Karl from Customer Care.

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Karcher PS40 Power Scrubber Brush/Broom Extension for Electric Power Pressure Washers K2-K5

Product ID: 2139403

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💨Integrated squeegee for fast water removal

🚿3 high-pressure nozzles

🧹11.5" wide scrubbing path

Description

🧼 Scrub smarter, not harder — power clean like a pro!

STREAK FREE FINISH - Fixed nozzle height ensures a flawless, streak-free clean on driveways, sidewalks, and stairs.
SPLASH BACK DEFENSE - Stiff bristles prevent messy splash-back, keeping your cleaning precise and controlled.
TRIPLE NOZZLE POWER - Maximize cleaning efficiency with three high-pressure spray nozzles working in perfect sync.
WIDE COVERAGE SWEEP - Clean large surfaces faster with an 11.5-inch wide scrubbing path that saves you time.
SPEEDY WATER REMOVAL - Integrated squeegee accelerates drying, so you’re done and dusted in no time.

The Karcher PS40 Power Scrubber Brush/Broom Extension is designed for Karcher K2-K5 electric pressure washers, delivering efficient cleaning with three integrated high-pressure nozzles and stiff bristles. Its 11.5-inch wide path and built-in squeegee speed up cleaning on hard surfaces like concrete, stairs, and pool areas, providing streak-free results while preventing splash-back.

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