Keeping roof clean

samZ4M · Post by **samZ4M** » Thu May 24, 2018 3:06 pm

I've done my convertible roof at the end of summer last year, but it's pretty green again (around the edge to the body work). Water flows off it well, so it's treated well, but it just goes green quickly (maybe a few months). I use the autoglym cleaner with the agressive sponge.

Am I missing something, is there a knack to it, or is this normal?

Phoenixboy · Post by **Phoenixboy** » Thu May 24, 2018 4:07 pm

I think whatever you clean it with, it will always come back ,especially if car lives outside.
I just accept it, clean it regularly between treatments and hoover it off.
its a small price to pay for top down motoring that the tin tops can only dream about.

Silverzedtom · Post by **Silverzedtom** » Thu May 24, 2018 5:47 pm

I use a brush designed for the job. It’s blue and yellow if end up looking for one. A sponge won’t dislodge the deep algae and grime so it will just keep growing.

I used to use AG but have found better results using raggtopp. I treat it every six months and just wash it with cold water and a brush every wash in between. If I garaged my car I’d probably hoover in between treatments.

Crazy Harry · Post by **Crazy Harry** » Thu May 24, 2018 6:10 pm

Have you use a diluted solution Milton Fluid? Been a damp 'green' winter and even now I'm going to clean mine again to try and clear the last few patches.

skelters · Post by **skelters** » Thu May 24, 2018 8:51 pm

I use the Autoglym kit along with a Vikan brush. It's like a big nail brush.

Works for a while then clean it off again. One of the hidden features of owning a convertible!

Others on here use the Milton stuff for the algae. There's a thread on it somewhere.

Z4 COUPSTER · Post by **Z4 COUPSTER** » Fri May 25, 2018 6:14 am

Crazy Harry wrote: ↑Thu May 24, 2018 6:10 pm Have you use a diluted solution Milton Fluid? Been a damp 'green' winter and even now I'm going to clean mine again to try and clear the last few patches.

X2 tried this on both cars. Works a treat

sticky · Post by **sticky** » Fri May 25, 2018 6:39 am

The "other" solution is buy a coupe,

Z4 COUPSTER · Post by **Z4 COUPSTER** » Fri May 25, 2018 6:45 am

sticky wrote: ↑Fri May 25, 2018 6:39 am The "other" solution is buy a coupe,

Doesn't work. Birds keep shitting on mine

sticky · Post by **sticky** » Fri May 25, 2018 7:46 am

Z4 COUPSTER wrote: ↑Fri May 25, 2018 6:45 am
sticky wrote: ↑Fri May 25, 2018 6:39 am The "other" solution is buy a coupe,
Doesn't work. Birds keep shitting on mine

Even worse when it"s on my ragtop, I live in Worthing and work right on the seafront,,,,, luckily a local garage has a self serve jet wash

Phoenixboy · Post by **Phoenixboy** » Fri May 25, 2018 10:20 am

sticky wrote: ↑Fri May 25, 2018 6:39 am The "other" solution is buy a coupe,

naahh, roof down and wear a cap

sticky · Post by **sticky** » Fri May 25, 2018 10:40 am

Phoenixboy wrote: ↑Fri May 25, 2018 10:20 am
sticky wrote: ↑Fri May 25, 2018 6:39 am The "other" solution is buy a coupe,
tonneau cover I'm thinking.... if they exist for a Z ??
naahh, roof down and wear a cap

Phoenixboy · Post by **Phoenixboy** » Fri May 25, 2018 10:46 am

the cover sounds good in theory, but if the roof is wet and you cover it, you trap all the moisture inside and will make it worse.

samZ4M · Post by **samZ4M** » Fri May 25, 2018 11:15 am

Seems it's fairly normal then. I'll give it a scrub and look into the miltons thing. thanks all

paullyjay · Post by **paullyjay** » Fri May 25, 2018 1:30 pm

I used the genuine BMW stuff - seemed to work well, but when I bought my Zed recently it had been garaged most of its life, so I don't know if the roof was black because it had been cleaned for sale or because it has never been kept outside...

These products are cheaper when bought on amazon and come direct from Park Lane BMW...
Cleaner - https://www.amazon.co.uk/BMW-Genuine-Co ... 1WWMMRR9VV
Water repellant impregnating agent - https://www.amazon.co.uk/BMW-Genuine-Wa ... M86JY0EDG4

Before cleaning and treating the rain would just soak into the roof... Now it mostly runs off...

ThomasDE85Z4 · Post by **ThomasDE85Z4** » Tue May 29, 2018 11:34 pm

I was having an issue with streaks after pressure washing and was looking for a method of cleaning the roof so that it looks black without dirt streaks

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