Is the handle adjustable?

No. It is a fixed 20-inch plastic handle. That reaches most car and pickup windshields but not the roof glass of tall trucks or RVs.

Can I replace the rubber blade?

Yes. The natural rubber blade is replaceable, so you keep the handle and scrubber and swap the blade when it wears or nicks.

Does it come with a scrubber too?

Yes. One side is a heavy-duty mesh scrubber for loosening bugs and road film; the other is the rubber squeegee blade.

Is it ready to use out of the box?

Yes. It arrives fully assembled, so there is no setup beyond wetting the glass and scrubbing.

Is it good for home windows as well as cars?

It works on flat glass, but the 10-inch head and 20-inch handle are sized for vehicle windshields. For tall house windows you would want a longer or telescoping handle.

How does it compare with a telescoping squeegee?

It is simpler and sturdier at the joint because there is no joint, but it gives up reach. Choose it for cars and fleet windshields; choose a telescoping model for high or deep glass.