How to clean rust from inside a plastic bottle, coolent reservoir of a Vauxhall corsa?

Its coolent reservoir of M reg Vauxhall corsa, and it has rust inside, Is there anything which can clean rust from inside a plastic bottle.|||I just got done doing the same thing to a Montero overflow bottle. I didn't have a bottle brush so I used a heavy paper towel and wrapped/taped it around a screwdriver. I took the bottle off the car and put some dish washing soap and warm water in it the used the towel/screwdriver like a bottle brush and scrubbed the insides of the bottle. Took a little bit of time but i eventually got it perfectly clean. Rinse and repeat. A bottle brush would probably make the job easier though.|||had same problem with vauxhall vectra bottle i removed bottle from engine bay and bunged up pipe exit,three quarter filled with limescale remover and water,left to stand for an hour,then gave it a vigerous shake,then rinsed well,replaced back in car. It look brand new!!!


take care to rinse well!

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|||baby bottle brush and a vacuum cleaner