Dirty crates and vans used to deliver food by Asda
An undercover investigation by BBC Watchdog Live reveals poor hygiene standards at supermarket giant Asda's home delivery service.
Watchdog's reporter was given no training on keeping delivery crates and vans clean.
The reporter witnessed spillages, but was told by senior drivers that there was no need to clear it up during the delivery round.
Asda says it has a "clean as you go" policy and staff get full training.
Both Asda employees and customers have contacted the consumer programme with allegations about the cleanliness of the store's delivery crates.
One driver told the programme: "There's no cleaning process in place. The crates are used over and over again, even after spillages. Most, if not all, are dirty, from food, and things like smashed eggs."
Another driver told the programme they are so concerned about poor hygiene, they are worried about their own family eating food from the crates.
Asda said the findings were "isolated examples and the opinion of individual colleagues".
It added: "The findings do not reflect the extensive policies and training they have in place, which are supported by independent third party audits."
The supermarket also says Watchdog's researcher did not receive the full role-specific training because he didn't do enough shifts.
In July, Asda announced it was removing the option to choose to have carrier bags with Home Delivery and Click & Collect orders.
The removal of bags means some food items are placed directly into crates, which Watchdog's investigation has found are not always clean.
Watchdog's undercover researcher saw delivery crates left on grassy and wet ground, going against Asda's own rules and risking bacterial contamination.
The company said it delivered almost half a million orders each week, using their totes more than 2.5 million times, and it was inaccurate and misleading to suggest that it did not have policies or training in place at a business level.
A previous Watchdog investigation highlighted hygiene concerns at Asda and its home delivery service.
Asda told the programme back in 2016 it would permanently improve standards across its home delivery service, including providing every driver with a spillage kit.
These processes were not being followed at the store where Watchdog went undercover.
Chartered environmental health practitioner Barrie Trevena said: "Even if the food you're putting in is wrapped, the packages then become contaminated and then when the customer handles the cans and the packages, then that's going to contaminate their worktop and fridge."
Presenter Steph McGovern said: "Asda need to sort this out, they've had years to do it."
Asda said: "We would like to reassure customers that food safety is their number one priority."
It added that it took every complaint seriously and was disappointed by Watchdog's findings, but it was confident in the cleaning and hygiene policies and processes "to uphold the high standards our customers rightly expect from Asda".
You can watch the full investigation on Thursday 19 September at 20:00 BST on BBC One or on iPlayer afterwards.