Checking to see if anyone knows how often you are supposed to remove the injectors to have them cleaned and tested?

There is no set interval but every 50-100k miles is a reasonable range to keep them in top form.

Yep, not a bad idea every 100k miles.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Do you have to send them off some place to have it done??

Your local diesel injection shop can do it for you.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

if you are hardcore, just invest and make your own tester

i could have made 4 testers by now, o well

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1985 300D - 599,xxxk - blue interior #265 Monark Nozzle, AL129X, 15" Ronals, Gen II Big Brakes hunting
1985 300D - 491,xxxk - in prog-{A-A IC, 3" exhaust, psi\pyro, 28*BTDC, Hella Euros, IP Limiter removal
1985 300TD - 783,xxxk - parts car,used new engine with ALDA cap inplace
1987 Kenworth T-600 8LL 425 CAT Mech. - 6,000,000+k - DEI exhaust wrap, punched through resonators, 1 recent rebuild,

DO you have any idea how much it costs to get it done??

I paid $10.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200