This is a fairly easy but somewhat time consuming job. However, if you maintain the roof, you are less likely to have
problems later on. Fixing a broken roof or replacing it can be a lot more costly and painful than yearly maintenance.
You don't need much for this. A cut down paintbrush, your Mum's toothbrush and lithium (LM) grease.
First off you need to clean the runners. You need to remove all old grease and crap.
You need a cleaning spray or maybe a steam cleaner. Clean out the channels with a toothbrush.
Get your cut down paintbrush and distribute lithium (LM) grease through the roof bars.
Distribute it with the toothbrush.
Make sure you get the lithium grease right down the runners attached to the car.
Operate the roof back and forth a few times to distribute the grease. You can also use spray lithium grease.
Using a rubber seal tretment like Gummi Pflege Stift, clean and condition all of the seals.
Over a year, the roof can get dirty. Bird poo, tree sap and general grime will stain the canvas.
Using a medium stiffness brush, brush all of the loose detritus off the roof.
Spray on your roof cleaning spray. These can be bought online from eBay or car shops like Halfords or Pep Boys etc.
Rub it into the roof with a moist clean cloth...
...scrub the cleaner into the canvas with the medium bristle brush...
... until the roof looks even and clean.
Remove as much of the cleaner as you can using a clean wet cloth. Then pat dry with a clean towel.
You should then have a roof conditioner spray in the kit. This keeps the canvas flexible.
Rub it into the canvas with a damp cloth and then clean it off with a clean damp cloth.
Allow the roof to dry naturally before carrying on to the next step.
You'll need some waterproof spray, either for soft tops or tents etc.
Mask off the area surrounding the roof. Test on an inconspicuous area in case it turns your cabrio to shit.
Spray approximately 30cm from the roof. Overlap each spray and keep it even.
Do 3 or more full coats (finish the can), allowing each coat to dry for an hour.
Allow the last coat to dry for a full day. Brush the whole roof down with the medium bristle brush.
Depending on how dirty your roof gets and if you park under trees, you may have to redo this every year or 2.
Obviously read the instructions on your products.