A radiator cleaning solution that lets you effectively scrub a radiator interior without risking the seals, acrylic or other components elsewhere in the loop. Dilute, fill, cap, shake, and leave it an hour. It lifts the flux residue and solder debris that ship inside every brazed radiator from the factory. Bottle only, use your own plastic fill-port fittings to seal the radiator while it works.
· Rad Clean — Standard
Radiator flush · Off the loop
Rad Clean — Standard
Radiator-only flush, for the brazing flux and solder debris three hot-water passes will never reach.
½Half a bottle, 1 oz
32ozDistilled, RO or DI
1hFlip at 30 minutes
Buy Rad Clean$8.99
Up to 8Radiators per bottle
Reuse the batchDrain it into the next radiator
Plastic caps onlyNot nickel, not aluminum
Never in a loopRadiators only, off the loop
01
Why radiators get their own flush
Brazing flux and solder debris ship inside every radiator. Three hot-water passes will never reach them.
Hot water first
Three passesShake 60 seconds in every axis, drain, repeat until clear.
Then Rad Clean
One hourFill completely, cap, shake, flip at 30 minutes.
Then SysPrep
On the first fillThe radiator is bare metal now. Condition it with the loop.
02
Use it in five steps
- 1
Cap with plastic fittings
Plastic caps and o-rings only. Set metal fittings aside.
- 2
Three hot distilled passes
A third full, shake 60 s in every axis, drain, repeat.
- 3
Mix and fill
Half a bottle into 32 oz of distilled. Fill the radiator completely.
- 4
One hour, flip at 30 min
Shake occasionally so both ends get contact.
- 5
Drain, rinse twice, dry
Then run SysPrep on the first fill.
03
What it works with, at a glance
✓Use with
- Radiators, on their ownOff the loop, never running in it.
- Plastic fill-port capsWith o-rings.
- Distilled, RO or DI water32 oz per half bottle.
✕Never with
- Nickel-plated fittings or partsPlastic caps only while it works.
- Aluminum partsNot compatible.
- Inside a running loopRadiators only.
- 1oz
Per 32 oz
Half the bottle.
- 1h
Run time
Flip at the 30-minute mark.
- 8
Radiators
Per bottle, reusing the batch.
- Stage 1
In the sequence
Before the loop is assembled.
04
The full story
05
