Leaking radiator brown liquid

Hi, I new to here,
I have a small radiator that is leaking out brown liquid from the right side where you put the key in.It is not coming out fast but I put the radiator on last night and it made it come out more.It was coming out though when we havent had the heating on for months.
We had a leaking radiator in the living room 4 months ago and it was coming out of the middle.
Is this because there is rusting in the whole system and does it mean the boiler needs scaling or flushing out??.

Sounds like oxidisation, a constant leak will allow fresh water into the system rich in oxygen which will eat your steel rads esp if you have no inhibitor added.
Sort the leaks out and give it a flush, manual or power using the correct chemicals.
If the rads are leaking from seams you will have to replace them, get on your knees and have a look under to see any rust or bubbling.

Pete

**** And do it fast *** as the leaks will ruin your carpets or other flooring, and the ceilings below.

Given time, rust holes get worse, not better.

After replacing the leaking parts, give the whole system a flush out, chemical clean, and refill with corrosion inhibitor.

You will NEVER remove rust stains. So do as JohnD suggests.

Thanks for the replies,
What we assumed.Can anyone advise us how to use the inhibitor solution as it makes no sense on the bottle from the shops??.

agree with replys also check water not pumping over into header tank this oxygenates water and causes brown rusty water and rots rads.
dave

You need a chemical cleaner first.

Drain the system and flush it a few times to get out as much loose stuff as you can. Bale out the sludge from the F&E tank and sponge it clean. If you feel strong enough, take off each radiator and hose them through vigorously (outside) to wash out loose sediment.

Inspect for worn valves, rusty rads and other sources of leaks, and replace them.

Tip the cleaning chemical into the header tank, then turn on the water and let it run down and fill the rads. Stir it in well to make sure it mixes with the water.

Inspect for leaks.

Vent all rads.

Run for a couple of weeks. Start cold and gradually increase water temp. Vent rads repeatedly. Inspect for leaks some more. Observe if there is any water coming out of the vent pipe above the F&E at any time. Then drain, flush, drain, refill. This time add the inhibiting chemical before you turn the water on