The westbound Mobil service station on the Western Freeway and the attached McDonald's restaurant were both added to the list of tier one exposure sites late Monday night after a positive case visited the site on Thursday evening.

The positive case was part of a group of three removalists travelling from Sydney to Melbourne while infectious.

The site closed for deep cleaning about 7pm on Monday and reopened just after 11.30am on Tuesday.

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Mobil Ballan West manager Pauline Heywood said she was first made aware the service station had become an exposure site late Monday afternoon.

You can see all the exposure sites here.

Ms Heywood said she received a call from the Department of Health and Human Services who suspected an infectious person had attended the service station.

"It took us a while to locate what they were looking for in the footage. We sent them a QR code that truck drivers have to sign in with when they have a shower and that's what led them to believe that they came here, which they did. We reviewed the footage and they did come here," she said.

"Then we had to shut down, us and McDonald's. McDonald's is very proactive. We had their cleaners come in and clean the whole site this morning, deep cleaned the site and had to email the health department once it was all done with the photos and show them and then they sent us the email back to say we could reopen.

"The site's been deep cleaned everywhere on the site, kitchens, toilets, showers."

Ms Heywood said the scare had made her more aware of the virus, but also attracted negative comments directed at the business.

"The negative comments are not appreciated, what people say, we didn't instigate it and I'm sure these guys didn't deliberately come here and give us what we've been through in the last 12 hours, that's for sure," she said.

"You can only ask people to sign in or scan in. If they haven't got a mask on you, they either acknowledge you and say sorry and go back to the car to get it, or they abuse you so what do we do?"

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