I clean ovens but to be honest with ya I hate em.
Done quite a few kitchen cleans too and the money isnt that good on par with the time scale to complete.
You usually have to do them at unsociable hours and 9 time out of 10 the ovens wont have cooled down so more time waiting 4 that.
if you use a caustic bath u need a fairly large van plus the obvious ppe.
If i was you id sub oven cleans and just take a cut
Regards Marc