function carWash (input) {

  let value = 0;

  let soap = x => x + 10;
  let water = x => x + x * 0.2;
  let vacuum = x => x + x * 0.25;
  let mud = x => x - x * 0.10;

  for (let i = 0; i < input.length; i++){

    if (input[i] === 'soap') {
      soap(value);
    } else if (input[i] === 'water') {
      water(value);
    } else if (input[i] === 'vacuum cleaner') {
      vacuum(value);
    } else {
      mud(value);
    }

  }

  console.log(`The car is ${value.toFixed(2)}% clean.`);
}

carWash(['soap', 'soap', 'vacuum cleaner', 'mud', 'soap', 'water']);