Co-mingling of funds is when separate property funds are mixed with community property funds.  This does not mean that it's impossible to unmix the funds for the purposes of a divorce action.  It just takes work to show when the funds went in and when they ent out.  If you can trace the funds, then you can continue with a separate property claim.  If the funds are just way to co-mingled where you cannot prove what went in and out, then they will be deemed community property.  To trace a claim, gather all of your receipts and documents and outline them in a spreadsheet.  This will be the beginning of your proof presentation.