Waka Eastern Bay was left trying to decide if they could operate their transport services this week after three of their vehicles were vandalised with offensive language.

The not-for-profit organisation completes more than 600 trips in a month, transporting primarily elderly and disabled passengers to medical appointments or shopping visits.

Their vehicles were parked behind Knox Presbyterian Church on Domain Road when they were tagged overnight Saturday. Only one vehicle in the fleet escaped the graffiti because it was parked elsewhere.

Offensive language including racial slurs and gang-related slang was graffitied onto the vehicles.

The incident was reported to police.

Waka Eastern Bay transport manager Candice Donner said it was disappointing the vehicles had been targeted, including their only wheelchair-accessible van.

Clean-up efforts started on Sunday, but permanent marker on the white paint proved particularly difficult to remove.

Several different cleaning products had to be purchased as a result.

Ms Donner said the team met early Monday morning to consider whether they could carry out their planned services with their vehicles not entirely clean of the graffiti.

“It’s disappointing because of the service we provide to the community. Someone’s bit of fun has had quite an impact.”

The decision was ultimately made to fulfil their scheduled trips.

Ms Donner said Waka Eastern Bay would be doing what it could to remain operational for its community while cleaning continued.

The volunteer-driven transport service has grown significantly this year, tripling its number of monthly trips compared to January.