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You won't believe the perks some companies are offering

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Reap the Benefits

Can't find time to have your car washed? Or to get your prescription drugs filled? Employees at a growing number of companies are relying on their employers to handle those errands.

Perks like these are part of a growing list of incentives companies are providing to supplement standard benefits like health insurance in an effort to help attract and retain employees. San Francisco-based Genentech's standard suite of benefits, for example, includes a concierge service that offers on-site haircuts and car washes. St. Paul, Minn.-based 3M's employees have access to an on-site pharmacy.

And perks aren't limited to on-demand services. Earlier this month, it was reported that private equity firm KKR not only offers 16 weeks of paid parental leave, as of May, but will also pay for new parents to bring their baby and a nanny along on business trips for the first year. Netflix also announced this month that it will start offering "unlimited" paid leave for employees during their first year as new parents, joining other tech companies like Google, Facebook and Apple with generous parental leave policies. And in March, Vodafone introduced a mandatory minimum maternity policy that requires all 30 of its globally operating companies to offer at least 16 weeks of fully paid leave to expectant mothers. For the first six months after returning from leave, new moms will also receive full pay for 30-hour weeks.

They've got plenty of financial incentive to offer such perks: The cost of replacing an employee can be as high as 90 to 200 percent of that employee's annual salary, according to the Society for Human Resource Management. And there is evidence that perks can boost loyalty. In a recent survey by MetLife, half of employees said benefits are an "important reason" they remain with their employer.

From mobile manicures to unlimited time off, here are some of the more unusual work perks companies have added.

By Lucy Maher, special to CNBC.com. Updated by CNBC.com staff on August 20, 2015.

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