Ok here is Part 1 of the guide, hopefully it should be of some help, the next step will be along shortly, but as I am currently only half way through that myself I thought I would just upload this to get you started
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The first step is to remove your BMC CDA from your car, you will notice that on each end is written either “Engine Side” or “Air Flow Side”. Remove the four screws located on the outer carbon fibre casing at the “Air Flow Side” you will then be able to slide the internal filter element out of it’s casing.
It is at this time you can gently tap the filter element with your fingers to remove any loose debris.
Once you have done this you can now move onto the proper cleaning process using a genuine BMC Air Filter washing kit, please see below for an example:
Firstly you will need a old washing up bowl or a bucket, place the filter element in the bowl/bucket at a slight angle, please see below:
As you can see from the above picture my filter element was very dirty and definitely needed a thorough clean. The next step is to use the Detergent supplied with the cleaning kit, attached the nozzle provided to the bottle and then proceed to dispense the fluid equally into all the contours of the filter, please see the picture below:
As you can see the detergent will begin to break down the dirt and oil contained in the filter element, it will drain out of the bottom of the filter and collect in the bowl/bucket, once you have ensured that the entire filter has been fully coated leave the detergent to work for 10 minutes.
After 10 minutes you should be able to see that a lot of dirt, oil and general grime has collected in your bowl/bucket, but you will also notice that your filter is still likely to be quite discoloured/blackened from remaining contaminants:
Fear not however as the next step is to gently rinse the filter with clean water, this will remove the remaining contaminants. You can either place your filter under a household tap using mildly warm water at a very low pressure as I personally did, or you can use a beaker of water and again gently dispense it over the filter.
In my case it took around five minutes of slowly rotating the filter under the tap and gently rubbing it with my fingers (I used latex gloves to keep any chemicals from touching my hands) to remove the last of the contaminants. Give the filter element a slight shake to remove any water that may be trapped inside it and then you can carefully pat the outside of the filter dry using paper kitchen towel.
After doing this I was left with this:
You will now need to leave the filter to dry naturally,
DO NOT be tempted to try and speed the process up by using a hair dryer or similar. I personally left my filter element 24 hours inside the house to let it fully dry.
The next part of the process is the re-oiling the filter element...
. But once it arrives I will be happy to 
