BMW: BMW 325ise E36, car wont start, memory chip

Question
Josh, i know your expertise is in the e30 but thought i would try you on an e36. I have a 325i which was parked up for a few months, but drove perfectly before then. I took it out the garage and drove it down the motorway at about 90mph and car drove well. I then cam home and parked the car, but it won't start now. I can turn the ignition, but it just won't start. I took the car for a wash before parking it up, and although it drove after this, someone told me that they know of a problem with theses cars not starting after being pressures washed and needs something done with the memory chip. I never washed under the bonnet - just the exterior. Any ideas?  

Answer
Paul,
 When you say the car wont start, what EXACTLY do you mean.  Will the engine spin, but not start.  or when you turn the key do you just hear a "Click" and nothing happens.  
 Give me a little more info and we'll go from there.
 Thanks
 Josh