Fazerloz
In relation to your comments about your girlfriend using the toilet, (which I hope you have shared with her), you can eliminate smells in your toilet compartment by fitting a SOG system. This also means that you do not have to use chemicals to stop the toilet smelling which is much better for the environment and cheaper in the long run. Some people on this forum have the in my view erroneous opinion that SOG systems suck smells to the outside of the van. So long as the appropriate filter is fitted and changed at the first sniff of external smells there should be no problem in this respect. Please see: What is a SOG ? - SOG Toilet Kits, SOG Systems
If only people would change the filters. I've spoken to people with SOG units that didn't even know there was a filter.