WD-40 is mostly mineral spirits, which is what does the cleaning. Mineral spirits are available as generic paint thinner in the paint aisle of any hardware store at a fraction of the cost of WD-40.
15 BMW RnineT
10 Ducati 1098 Streetfighter S - "Sleipnir"
09 Kaw Versys
67 Triumph Bonneville TT Special