So you have been doing it for 10 years , you could have been doing it wrong for every one of those 10 years, I have been in clening for 19years , still some things re not done correctly.
You have to do a risk assessment on each job , its the law, I have self carbonating books printed up , with a tick sheet RA , takes 5 mins to do on each job , I know I am legal , the customer knows I am legal , as they get a copy too , and have to sign it.
When you say at your own risk , great! what about the public ? there is a risk , however small , what about the kid who wanders onto the place you are working, what about the old dear who trips on your hose. Why not spend 50 quid printing off some forms , fill them out and do the job right.
15 quid will buy you some ornacide too and make shifting the Pigeon guano easier and safer. Just spray it on , let it dwell for 15 min and it will clean off easier.