Every pressure washer in this collection has one thing the rest do not: the hose winds itself back in. Give it a tug, let go, and the reel does the work. It sounds like a small thing. In practice it is the difference between a tool you use and a tool you own.
The pack-up problem
Nobody minds washing the car. What people quietly hate is the five minutes afterwards coiling wet hose in loops that will be a tangle by next weekend. That step is why most pressure washers end up used a handful of times a year. Remove it and the whole thing changes.
What to look for in a retractable unit
Locking at length
A good reel locks wherever you stop pulling, so you are not fighting the spring the entire time you are washing. Check this before you buy, because a reel that constantly pulls back is worse than no reel.
Reel length versus your space
Thirty metres sounds like a lot until you route it around a car, out a garage door and down a driveway. Measure the real path, not the straight line.
Mounting height
Mount high enough that the hose is not dragging on the ground when extended, low enough that you can reach the controls without a step.
The three units
Blahst R30
The long-reach option at 30 m, and the one to pick if you have a driveway or a double garage to cover. Blahst R30.
Blahst R18
Shorter reel, same format, lower spend. Suits a single garage or a courtyard where 30 m would just be hose you never use. Blahst R18.
Giraffe Grandfalls PRO
The main alternative to the Blahst units, with an integrated reel and a strong following among detailers. Grandfalls PRO.
R30 or Grandfalls PRO
This is the comparison most people land on, and it is close enough that it is worth reading properly rather than guessing. We have written it up in full: Blahst R30 vs Giraffe Grandfalls PRO.
Finishing the setup
A retractable washer pairs naturally with a retractable vacuum on the same wall. Same principle, same reason it gets used.