Surface cleaner advice

I have a question about my surface cleaner
It’s a 15 inch metal surface cleaner on wheels I purchased off Amazon. Not much information came with it other than it’s rated 4000 psi max, no info on gpms, I have a Simpson 3200psi 2.5 gpm machine, it run the surface cleaner but it always seems to leave stripes no matter what I do, I’ve tried moving at snail speed and still stripes driveways, I’ve removed cleaned and angled the tips every which way and still stripes, even after pre treating with SH. soon I will be upgrading to a 4.0gpm 4200 psi machine, I’m curious if the tips on it are not correct for my machine, they are not labeled. I’d like to try a new set of tips to see if I can make more efficient but I have no clue what tips I would need.
Any advice or input would be greatly appreciated!

Buy a 19in eagle wash and an 8 gpm machine to run it. Saving up isn’t a good business strategy. Buy what you need now, not later.

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It’s leaving stripes because your machine is barely one step above an electric and only puts out 2.5gpm. Not being snarky, I went through that nonsense three years ago when I started out.

Post a pic of your surface cleaner

With that baby pressure washer you’re probably only getting 1500 psi max out of your surface cleaner. That’s guessing it came with #2 tips. You need at bigger pressure washer to run a surface cleaner.

It’s going to be annoying but try to rinse every other pass. A ball valve to disconnect and switch tools would speed it up some. Surface cleaners will clean very well… but if you aren’t pushing out enough water the dirt will be lifted and settle back causing stripes. So either upgrade to a bigger machine or rinse more… this is just one idiots advice. I know very little about tips… my response is just an attempt to help you use what you have already until you fix the issue permanently.

The stripes are caused by not cleaning good enough. They are where you overlap, so going over the same spot twice is cleaner and obvious to see. This is why you can eliminate striping by going over it again or really slow. Post treating will help even it out too, but you have to be mostly clean to begin with. With a 2.5 gpm machine, he’s only getting 1500psi at best and with that low of volume, it’s just not getting anything clean. He simply needs a bigger pressure washer. There isn’t much sense in owning a surface cleaner just to wand back over the whole thing.